370zBLAST

So Saturday I called the reps at royal purple to see which gear oil is right for my 370z. While I was on the phone I also mentioned about my 6spd tranny oil. He said well 75w90 is what you need, it flows the same at cold weather like the factory stuff. I said I was told tho that it might give me harsh shifting. He said well off the records you can use a hps or XPR 10w40 that has the same additive like the 75w90. I meam I've heard of motor oil for manuals but has anyone tried this or heard of this? If so how do you like it?

Joey

Sent from my SM-N900P using Tapatalk